Interpolation

String interpolation with the $ operator is allowed in a command object, like this:

  file = "file1.txt" 
cmd = `cat $file` # equivalent to `cat file1.txt` 
run(cmd) #> prints the contents of file1.txt 

This is very similar to the string interpolation with $ in strings (refer to the Strings section in Chapter 2, Variables, Types, and Operations).

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